William m



(No Model.)

W. M. DIMITT.

AUGER BIT. No. 306,907. Patented 00c. 21, 1884.

WITNESSES: I DIVENTOR:

ATTGRNEYS.

UNITED STATES PATENT ()FFICE'.

WILLIAM M. DIMIT'I, OF MARTINSVILLE, OHIO, ASSIGNOR OF ONE-HALF TOCHARLES H. IRWIN, OF SAME PLACE.

AUGER-BI'T.

SPECIFICATION forming part of Letters Patent No. 306,907, dated October21, 1884.

Application tiled June {30, 1ss4. (No model.) I

10 all whom 1125 mm 1 concern:

Be it known that I, WILLIAM H. DIMITT. of Martinsville, in the county ofClinton and State of Ohio, have invented certain new and usefulImprovements in Auger-Bits, of which the following is a full, clear, andexact deseription.

This invention consists in a solid center-stem auger bit, substantiallyas hereinafter described and claimed, and \Vhlt'h not only possessesgreater stiffness and strength than the ordinary bit, but which providesa much readier clearance for the chips, and is therefore not so liableto choke, may be much more easily worked and sharpened or repaired; alsomakes a clear or smooth out.

Reference is to be had to the accompanying drawings, forming a part ofthis specification, in which similar letters of reference indicatecorresponding parts in a l the figures.

Figure 1 represents a longitudinal view of a single twist auger-bitembodying my invention; Fig. 2. a front end View of the same; Fig. 3, across-section thereof onthe line .70 x in Fig. l, and Fig. 4 alongitudinal section of the forward end of the bit on the line y y inFig. 1.

in the accompanying drawings, A indicates a solid center-bit stemmounted or formed with asingle-twist blade, B, which is an integralportion of the bit and forms a quick flat screwthread around the solidcenter stem that terminates at its forward end in a gimlet-screw, b.

From this description it will be seen that this auger bit has but oneedge or side out.

A hole can be made by it much more easily. o speedily, and smoothlytitan ispractirable with the ordinary double-twist bit having no so.idcentral stem. and a much larger, quicker, and

re ruier escape passage for the chips or borings is provided, therebyreducing the liability to 5 choke. Much greiter facility, too, isafforded for sharpening and re a ring the bit. Thus, being made with asolid central stem, the bit may be broken or cutaway at any point in thetwist and a new end gitnlet-srrew and cuttingedge be formed, whichcannot be done with angers having no solid central stem. The centralstem, too, adds materially t0 the stiffness and strength of the bit.

The invent-ion is applicable alike both to hand and machine angers. Whenapplied to machine use. it may be run with very much less power than theangers in ordinary use.

Havingthus described my invention, I claim as new and desire to secureby Letters Patent The solid auger-bit comprising the central stemhavingthesingleconvoluted blade formed with a single chisel or knifeedge cutter, said cutter being disposed at one Side of the stem and atthe lower end of the bla le, substantially as shown and descri-bed,andfor the purpose set forth.

WILLIAM M. DIMIT'I.

Witnesses:

J. D. OUsLEY, W. W. WALKER.

